Pin ING to one step authentication (#182)

Author: sebira

fints/client.py

@@ -51,6 +51,10 @@
 DATA_BLOB_MAGIC = b'python-fints_DATABLOB'
 DATA_BLOB_MAGIC_RETRY = b'python-fints_RETRY_DATABLOB'
 
+# workaround for ING not offering PSD2 conform two step authentication
+# ING only accepts one step authentication and only allows reading operations
+ING_BANK_IDENTIFIER = BankIdentifier(country_identifier='280', bank_code='50010517')
+
 
 class FinTSOperations(Enum):
     """This enum is used as keys in the 'supported_operations' member of the get_information() response.
@@ -1257,6 +1261,8 @@ def _deconstruct_v1(self, including_private=False):
         return data
 
     def is_tan_media_required(self):
+        if self.bank_identifier == ING_BANK_IDENTIFIER:
+            return False
         tan_mechanism = self.get_tan_mechanisms()[self.get_current_tan_mechanism()]
         return getattr(tan_mechanism, 'supported_media_number', None) is not None and \
                 tan_mechanism.supported_media_number > 1 and \
@@ -1379,7 +1385,7 @@ def send_tan(self, challenge: NeedTANResponse, tan: str):
             return resume_func(challenge.command_seg, response)
 
     def _process_response(self, dialog, segment, response):
-        if response.code == '3920':
+        if response.code == '3920' and not self.bank_identifier == ING_BANK_IDENTIFIER:
             self.allowed_security_functions = list(response.parameters)
             if self.selected_security_function is None or not self.selected_security_function in self.allowed_security_functions:
                 # Select the first available twostep security_function that we support

fints/formals.py

@@ -160,6 +160,12 @@ class BankIdentifier(DataElementGroup):
     country_identifier = DataElementField(type='ctr')
     bank_code = DataElementField(type='an', max_length=30)
 
+    def __eq__(self, other):
+        if not isinstance(other, BankIdentifier):
+            return NotImplemented
+
+        return self.country_identifier == other.country_identifier and self.bank_code == other.bank_code
+
 
 @doc_enum
 class KeyType(RepresentableEnum):